先导顶拉管工艺在黑臭水体治理项目中的应用

Application of Pilot Pipe Jacking Technology in Black and Odorous Water Body Treatment Projects

摘要:

在黑臭水体治理项目中，在人口密集区进行雨污分流改造过程中，针对沿线空间狭窄，地下管线及障碍物复杂，地质条件差，地下水水位高，埋深较深的情况，明挖采用拉森钢板桩进行止水和支护时存在引起房屋开裂和安全隐患，需要大规模铺设长距离小管径污水支干管时。通过前期示范实验后，采用新型先导顶拉管工艺解决埋深较深时基坑抽水困难，减少对周边建（构）筑物影响等问题。在实施过程中管道高程控制精确，连接口密封良好，施工进度大幅提高，水流条件好，取得良好的效果。在含合流管网的污水系统中，顶拉管井直接作为检查井使用，系统调蓄容积减少溢流风险，增加污水管网系统安全韧性。

Abstract:

In the black and odorous water body treatment project, during the storm and sewage separation reconstruction in densely populated areas, aiming at the challenges such as narrow space along the route, complex underground pipelines and obstacles, poor geological conditions, high groundwater levels, and deep burial depths, Larsen steel sheet piles are used for the housing cracks and safety hazards caused by the water stopping and support in the excavation during the large-scale installation of long-distance small-diameter sewage branches. After early demonstration experiments, a new pilot pipe jacking process is adopted to solve the difficulties in dewatering foundation pits at greater depths and reduce the impacts on surrounding structures. During implementation, the pipeline elevation is precisely controlled, the connections are well-sealed, the construction progress is significantly accelerated, the hydraulic conditions are good and the excellent effects are achieved. In sewage systems with combined sewer networks, the pipe jacking shafts are directly used as manholes systematically to regulate and store the volume, reduce the overflow risks, and increase the safety and resilience of the sewage pipeline network.